package com.whfz.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.whfz.reggie.common.BaseContext;
import com.whfz.reggie.common.Contants;
import com.whfz.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登录
 */
@Slf4j
@WebFilter(filterName ="LoginCheckFilter",urlPatterns = "/*" )
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2、判断本次请求是否需要处理 如果不需要处理，则直接放行
        if (check(requestURI,urls)){
            log.info("放行");
            filterChain.doFilter(request,response);
            return;
        }
        //4.1、判断登录状态，如果已登录，则直接放行
         if (request.getSession().getAttribute(Contants.SESSION_EMPLOYEE)!=null){
             //将id存入ThreadLocal中
             BaseContext.setCurrentId((Long) request.getSession().getAttribute(Contants.SESSION_EMPLOYEE));
             filterChain.doFilter(request,response);
             return;
         }
        //4.2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute(Contants.SESSION_USER)!=null){
            //将id存入ThreadLocal中
            BaseContext.setCurrentId((Long) request.getSession().getAttribute(Contants.SESSION_USER));
            filterChain.doFilter(request,response);
            return;
        }
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        log.info("登录失败");
         response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
         return;
    }
    public boolean check(String requestURI,String[] urls){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }return false;
    }
}
